Question

class: aves (avis :bird) explain this
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Answer 1

Answer:

Forelimbs are modified into wings.

Some birds have lost the capacity to fly e.g. Ostrich.

Hind limbs are used for walking, clasping tree branches and running.

Aquatic birds have webs between their toes e.g. Duck.

They are homeotherms.

Exoskeleton is made up of feathers.

Answer 2

Aves is a term used to indicate birds.

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• They have feathers.

• Most of them can fly, except flightless birds like Ostrich.

• They have beak

• Their fore limbs are modified into wings.

• The hind limbs have scales

• The hind limbs help them for walking, swimming or clasping branches.

• They have hollow bones with air cavities.

• Heart is four chambered.

• Respiration is by lungs.

• Air sacs are connected to lungs

• They are oviparous

• Their skin is dry.

• They don't have gland except at the base of tail.

• Their digestive tract has additional chambers.

• They are warm blooded.

eg:- Crow (Corvus), Peacock (Pavo)